ART. 10 GALL-INHABITING CYNIPID WASPS WELD 35 



above transverse, not quite as wide as thorax, cheeks not broadened 

 behind e^'es, occiput concave; from in front broader than high, facial 

 area one and one-fourth times as broad as high, mahir space 

 one-third eye without groove, antenna 14-segmented, lengths 

 as (scape) 20 (width 10) : 9: 33(5) : 24:20: 19: 14: 12 : 10 : 9(7) : S : 8 : 

 6 : 9. Pronotum pubescent on sides. ISIesoscutum shining, smooth 

 with scattered punctures, sparsel}^ pubescent except on broad lateral 

 and anterior lines, parapsidal grooves deep, smooth, percurrent. Scu- 

 tellum rugose, not margined behind, transverse groove at base opening 

 on to disk behind and not sharply limited laterally. Carinae on pro- 

 podeum bowed out, widely separated below but close together and 

 parallel above. Second tarsal segment shorter than fifth, claws 

 stout and simple. Wing dusky, all veins very heavy, second abscissa 

 of radius angled and heavily clouded, third strongly curved and not 

 reaching margin, stouter at end; areolet lost in cloud in some speci- 

 mens, cubitus reaching basal. Abdomen not quite as long as head 

 and thorax, lengths of the three main tergites as 27 : 4 : 3, second with 

 sparsely pubescent patches at base and hind margin at angle of 45% 

 ventral valves oblique but inconspicuous, ventral spine horizontal, 

 stouter than in Andricus, triangular, hairy, ovipositor short, tip 

 straight. Using width of head as a base the length of mesonotum 

 ratio is 1.4, antenna 2.4, ovipositor 2.0, wing 4.0. Length, 2.4-3.5 

 mm. Average of 15 specimens, 3.0 mm. 



This species is close to D. Carolina (xlshmead) from which it is 

 separated by its black abdomen, the longer groove at base of scu- 

 tellum and more pubescent mesoscutum. Neither species strictly be- 

 longs in this genus because of the simple claws and heavj'' wing 

 venation. 



Tijpe.— Cat. No. 27194, U.S.N.M. Type and 3 paratypes. Para- 

 types at American Museum, Field, Stanford, and Philadelphia 

 Academy. 



Host. — Quercms stellata. 



Gall (fig. 9).- — Spherical, 5-7 nmi. in diameter, white, smooth, 

 single, always on under side of leaf saddled on a vein so that when 

 detached a depression (containing pedicel) and groove is left on 

 the gall. Occurs in fall. Monothalamous. A section through a 

 fresh gall shows a white fleshy interior containing a distinct but not 

 free larval cell, a tinge of red or brown just under the outer layer. 



Hahitat. — The type material Avas collected at Ironton, Mo., in 

 October, 1917, and adults emerged (in out-of-door cage near Chi- 

 cago) on May 15, 1918. The Avriler saw galls at Poplar Bluff also, 

 and at Iloxie, Little Rock, Hot Springs, and Texarkana, Ark; Pales- 

 tine. Trinity, C'uero, Poerne, Austin, College Station, and Arlington, 

 Tex.: and at Green Cove Springs, Fla. What seems to be the same 



